Hello Mary. Here are the inscriptions that may help you.
I do hope that they are helpful because they are an interesting lot :-
In affectionate remembrance of Elizabeth Ann, the beloved wife of William Robson of Burnhope, who departed this life September/4/1905 aged 47 years.
John Robson of Billin Side, died December the XXV11 MDCCXXV11 aged LX1X
Eleanor Robson, his wife died the 11 of April MDCCXL aged 80 years. (must have forgotten about the roman numerals or did not have space for them)
Thomas Robson of Barr gate, died June the XXV111 aged LV111 MDCL11.
(The spelling for Billin side and Barr Gate although correct as the inscription, I think should read Billingside and Bargate as in the Durhamplace names book.)
Thomas Robson of the Ford, died the 2nd day of March 1750 aged 46 years.
Sarah, his wife died December ye 28 1754 aged 63 ( the date look like they do not look correct but they are)
In memory of Margaret Pickering, daughter of Thomas Robson, Kings Burn, who departed this life September/20/1795 aged 27 years.
Also Joseph Robson, son of the above, died in the South Sea Fishery, November/6/1804 aged 26 years.
Also Edward Robson, brother of the above, died in his majesties Frigate, Scorpion, August/6th 1806 aged 30 years.
Also Thomas Robson, father to the above, died August/1/1807 aged 72 years.
Aforesaid Jane (after that unreadable)
This stone is erected by Thomas and Ann Robson of Harelaw, in affectionate remembrance if their son Benjamin Robson and the beloved husband of Ann Robson, who died 29/June/1889 aged 23 years.
In memory of John Robson of

?Green, who died May/11/1830 aged 79 years.
Also of Elizabeth his wife, who died November/28/1860 aged 95 years.
In loving memory of Margaret Robson, who died May/17/1923 aged 83 years.
Also Elizabeth, her daughter who died June ?? 194?
(lead letters have fallen out and is now unreadable )
In loving memory of Sarah Ellen, beloved wife of George W Robson, who died 20/May/1938 aged 51 years.
Also the above George W Robson, who died 25/February/ aged 84 years.
( after my cut off date, request the year if you think it may help )
Adam